fix RT gettxout

iguana/iguana_msg.c

@@ -236,6 +236,14 @@ void iguana_gotaddr(struct iguana_info *coin,struct iguana_peer *addr,struct igu
     expand_ipbits(ipaddr,ipbits);
     if ( port != 0 )
         sprintf(ipport,"%s:%d",ipaddr,port);
+    if ( 0 )
+    {
+        int32_t i;
+        printf("{{");
+        for (i=0; i<16; i++)
+            printf("0x%02x%s",A->ip[i],i<15?",":"");
+        printf("}, 14631},\n");
+    }
     iguana_possible_peer(coin,ipport);
     //printf("gotaddr.(%s:%d) from (%s)\n",ipaddr,port,addr->ipaddr);
 }

iguana/iguana_stake.c

@@ -0,0 +1,860 @@
+#ifdef reference
+static const int64_t COIN_YEAR_REWARD = 5 * CENT; // 5% per year
+int nCoinbaseMaturity = 100;
+static const int STAKE_TIMESTAMP_MASK = 15;
+
+// MODIFIER_INTERVAL_RATIO:
+// ratio of group interval length between the last group and the first group
+static const int MODIFIER_INTERVAL_RATIO = 3;
+
+CBigNum bnProofOfStakeLimit(~uint256(0) >> 20);
+CBigNum bnProofOfStakeLimitV2(~uint256(0) >> 48);
+
+unsigned int nTargetSpacing = 1 * 60; // BitcoinDark - 1 minute
+static const int64_t nTargetTimespan = 60 * 60;  // BitcoinDark - every 1 hour
+unsigned int nStakeMinAge = 8 * 60 * 60; // BitcoinDark - 8 hours
+unsigned int nStakeMaxAge = -1;
+unsigned int nModifierInterval = 10 * 60; // BitcoinDark - time to elapse before new modifier is
+
+unsigned int nStakeSplitAge = 1 * 24 * 60 * 60;
+int64_t nStakeCombineThreshold = 1000 * COIN;
+
+enum
+{
+    BLOCK_PROOF_OF_STAKE = (1 << 0), // is proof-of-stake block
+    BLOCK_STAKE_ENTROPY  = (1 << 1), // entropy bit for stake modifier
+    BLOCK_STAKE_MODIFIER = (1 << 2), // regenerated stake modifier
+};
+
+uint64_t nStakeModifier; // hash modifier for proof-of-stake
+unsigned int nStakeModifierChecksum; // checksum of index; in-memeory only
+
+
+uint256 CBlockIndex::GetBlockTrust() const
+{
+    CBigNum bnTarget;
+    bnTarget.SetCompact(nBits);
+    
+    if (bnTarget <= 0)
+        return 0;
+    
+    return ((CBigNum(1)<<256) / (bnTarget+1)).getuint256();
+}
+
+unsigned int GetStakeEntropyBit() const
+{
+    return ((nFlags & BLOCK_STAKE_ENTROPY) >> 1);
+}
+
+bool SetStakeEntropyBit(unsigned int nEntropyBit)
+{
+    if (nEntropyBit > 1)
+        return false;
+    nFlags |= (nEntropyBit? BLOCK_STAKE_ENTROPY : 0);
+    return true;
+}
+
+bool GeneratedStakeModifier() const
+{
+    return (nFlags & BLOCK_STAKE_MODIFIER);
+}
+
+void SetStakeModifier(uint64_t nModifier, bool fGeneratedStakeModifier)
+{
+    nStakeModifier = nModifier;
+    if (fGeneratedStakeModifier)
+        nFlags |= BLOCK_STAKE_MODIFIER;
+}
+
+// miner's coin stake reward based on coin age spent (coin-days)
+int64_t GetProofOfStakeReward(int64_t nCoinAge, int64_t nFees)
+{
+    int64_t nSubsidy = nCoinAge * COIN_YEAR_REWARD * 33 / (365 * 33 + 8);
+    return(nSubsidy + nFees);
+}
+
+//
+// maximum nBits value could possible be required nTime after
+//
+unsigned int ComputeMaxBits(CBigNum bnTargetLimit, unsigned int nBase, int64_t nTime)
+{
+    CBigNum bnResult;
+    bnResult.SetCompact(nBase);
+    bnResult *= 2;
+    while (nTime > 0 && bnResult < bnTargetLimit)
+    {
+        // Maximum 200% adjustment per day...
+        bnResult *= 2;
+        nTime -= 24 * 60 * 60;
+    }
+    if (bnResult > bnTargetLimit)
+        bnResult = bnTargetLimit;
+    return bnResult.GetCompact();
+}
+
+//
+// minimum amount of stake that could possibly be required nTime after
+// minimum proof-of-stake required was nBase
+//
+unsigned int ComputeMinStake(unsigned int nBase, int64_t nTime, unsigned int nBlockTime)
+{
+    return ComputeMaxBits(bnProofOfStakeLimit, nBase, nTime);
+}
+
+static CBigNum GetProofOfStakeLimit(int nHeight)
+{
+    if(IsPoSV2(nHeight))
+		return bnProofOfStakeLimitV2;
+	else
+        return bnProofOfStakeLimit;
+}
+
+unsigned int GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake)
+{
+	CBigNum bnTargetLimit = fProofOfStake ? GetProofOfStakeLimit(pindexLast->nHeight) : bnProofOfWorkLimit;
+    
+    if (pindexLast == NULL)
+        return bnTargetLimit.GetCompact(); // genesis block
+    const CBlockIndex* pindexPrev = GetLastBlockIndex(pindexLast, fProofOfStake);
+    if (pindexPrev->pprev == NULL)
+        return bnTargetLimit.GetCompact(); // first block
+    const CBlockIndex* pindexPrevPrev = GetLastBlockIndex(pindexPrev->pprev, fProofOfStake);
+    if (pindexPrevPrev->pprev == NULL)
+        return bnTargetLimit.GetCompact(); // second block
+    
+    int64_t nActualSpacing = pindexPrev->GetBlockTime() - pindexPrevPrev->GetBlockTime();
+    if (nActualSpacing < 0)
+        nActualSpacing = nTargetSpacing;
+    
+    // ppcoin: target change every block
+    // ppcoin: retarget with exponential moving toward target spacing
+    CBigNum bnNew;
+    bnNew.SetCompact(pindexPrev->nBits);
+    int64_t nInterval = nTargetTimespan / nTargetSpacing;
+    bnNew *= ((nInterval - 1) * nTargetSpacing + nActualSpacing + nActualSpacing);
+    bnNew /= ((nInterval + 1) * nTargetSpacing);
+    
+    if (bnNew <= 0 || bnNew > bnTargetLimit)
+        bnNew = bnTargetLimit;
+    
+    return bnNew.GetCompact();
+}
+
+// ppcoin: total coin age spent in transaction, in the unit of coin-days.
+// Only those coins meeting minimum age requirement counts. As those
+// transactions not in main chain are not currently indexed so we
+// might not find out about their coin age. Older transactions are
+// guaranteed to be in main chain by sync-checkpoint. This rule is
+// introduced to help nodes establish a consistent view of the coin
+// age (trust score) of competing branches.
+bool CTransaction::GetCoinAge(CTxDB& txdb, uint64_t& nCoinAge) const
+{
+    CBigNum bnCentSecond = 0;  // coin age in the unit of cent-seconds
+    nCoinAge = 0;
+    if (IsCoinBase())
+        return true;
+    BOOST_FOREACH(const CTxIn& txin, vin)
+    {
+        // First try finding the previous transaction in database
+        CTransaction txPrev;
+        CTxIndex txindex;
+        if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
+            continue;  // previous transaction not in main chain
+        if (nTime < txPrev.nTime)
+            return false;  // Transaction timestamp violation
+        // Read block header
+        CBlock block;
+        if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
+            return false; // unable to read block of previous transaction
+        if (block.GetBlockTime() + nStakeMinAge > nTime)
+            continue; // only count coins meeting min age requirement
+        
+        int64_t nValueIn = txPrev.vout[txin.prevout.n].nValue;
+        bnCentSecond += CBigNum(nValueIn) * (nTime-txPrev.nTime) / CENT;
+        
+        if (fDebug && GetBoolArg("-printcoinage"))
+            printf("coin age nValueIn=%"PRId64" nTimeDiff=%d bnCentSecond=%s\n", nValueIn, nTime - txPrev.nTime, bnCentSecond.ToString().c_str());
+    }
+    CBigNum bnCoinDay = bnCentSecond * CENT / COIN / (24 * 60 * 60);
+    if (fDebug && GetBoolArg("-printcoinage"))
+        printf("coin age bnCoinDay=%s\n", bnCoinDay.ToString().c_str());
+        nCoinAge = bnCoinDay.getuint64();
+        return true;
+}
+
+// ppcoin: total coin age spent in block, in the unit of coin-days.
+bool CBlock::GetCoinAge(uint64_t& nCoinAge) const
+{
+    nCoinAge = 0;
+    
+    CTxDB txdb("r");
+    BOOST_FOREACH(const CTransaction& tx, vtx)
+    {
+        uint64_t nTxCoinAge;
+        if (tx.GetCoinAge(txdb, nTxCoinAge))
+            nCoinAge += nTxCoinAge;
+        else
+            return false;
+    }
+    if (nCoinAge == 0) // block coin age minimum 1 coin-day
+        nCoinAge = 1;
+        if (fDebug && GetBoolArg("-printcoinage"))
+            printf("block coin age total nCoinDays=%"PRId64"\n", nCoinAge);
+            return true;
+}
+
+// Get time weight
+int64_t GetWeight(int64_t nIntervalBeginning, int64_t nIntervalEnd)
+{
+    // Kernel hash weight starts from 0 at the min age
+    // this change increases active coins participating the hash and helps
+    // to secure the network when proof-of-stake difficulty is low
+    
+    return min(nIntervalEnd - nIntervalBeginning - nStakeMinAge, (int64_t)nStakeMaxAge);
+}
+
+// Get the last stake modifier and its generation time from a given block
+static bool GetLastStakeModifier(const CBlockIndex* pindex, uint64_t& nStakeModifier, int64_t& nModifierTime)
+{
+    if (!pindex)
+        return error("GetLastStakeModifier: null pindex");
+    while (pindex && pindex->pprev && !pindex->GeneratedStakeModifier())
+        pindex = pindex->pprev;
+    if (!pindex->GeneratedStakeModifier())
+        return error("GetLastStakeModifier: no generation at genesis block");
+    nStakeModifier = pindex->nStakeModifier;
+    nModifierTime = pindex->GetBlockTime();
+    return true;
+}
+
+// Get selection interval section (in seconds)
+static int64_t GetStakeModifierSelectionIntervalSection(int nSection)
+{
+    assert (nSection >= 0 && nSection < 64);
+    return (nModifierInterval * 63 / (63 + ((63 - nSection) * (MODIFIER_INTERVAL_RATIO - 1))));
+}
+
+// Get stake modifier selection interval (in seconds)
+static int64_t GetStakeModifierSelectionInterval()
+{
+    int64_t nSelectionInterval = 0;
+    for (int nSection=0; nSection<64; nSection++)
+        nSelectionInterval += GetStakeModifierSelectionIntervalSection(nSection);
+    return nSelectionInterval;
+}
+
+// select a block from the candidate blocks in vSortedByTimestamp, excluding
+// already selected blocks in vSelectedBlocks, and with timestamp up to
+// nSelectionIntervalStop.
+static bool SelectBlockFromCandidates(vector<pair<int64_t, uint256> >& vSortedByTimestamp, map<uint256, const CBlockIndex*>& mapSelectedBlocks,
+                                      int64_t nSelectionIntervalStop, uint64_t nStakeModifierPrev, const CBlockIndex** pindexSelected)
+{
+    bool fSelected = false;
+    uint256 hashBest = 0;
+    *pindexSelected = (const CBlockIndex*) 0;
+    BOOST_FOREACH(const PAIRTYPE(int64_t, uint256)& item, vSortedByTimestamp)
+    {
+        if (!mapBlockIndex.count(item.second))
+            return error("SelectBlockFromCandidates: failed to find block index for candidate block %s", item.second.ToString().c_str());
+        const CBlockIndex* pindex = mapBlockIndex[item.second];
+        if (fSelected && pindex->GetBlockTime() > nSelectionIntervalStop)
+            break;
+        if (mapSelectedBlocks.count(pindex->GetBlockHash()) > 0)
+            continue;
+        // compute the selection hash by hashing its proof-hash and the
+        // previous proof-of-stake modifier
+        CDataStream ss(SER_GETHASH, 0);
+        ss << pindex->hashProof << nStakeModifierPrev;
+        uint256 hashSelection = Hash(ss.begin(), ss.end());
+        // the selection hash is divided by 2**32 so that proof-of-stake block
+        // is always favored over proof-of-work block. this is to preserve
+        // the energy efficiency property
+        if (pindex->IsProofOfStake())
+            hashSelection >>= 32;
+        if (fSelected && hashSelection < hashBest)
+        {
+            hashBest = hashSelection;
+            *pindexSelected = (const CBlockIndex*) pindex;
+        }
+        else if (!fSelected)
+        {
+            fSelected = true;
+            hashBest = hashSelection;
+            *pindexSelected = (const CBlockIndex*) pindex;
+        }
+    }
+    if (fDebug && GetBoolArg("-printstakemodifier"))
+        printf("SelectBlockFromCandidates: selection hash=%s\n", hashBest.ToString().c_str());
+    return fSelected;
+}
+
+// Stake Modifier (hash modifier of proof-of-stake):
+// The purpose of stake modifier is to prevent a txout (coin) owner from
+// computing future proof-of-stake generated by this txout at the time
+// of transaction confirmation. To meet kernel protocol, the txout
+// must hash with a future stake modifier to generate the proof.
+// Stake modifier consists of bits each of which is contributed from a
+// selected block of a given block group in the past.
+// The selection of a block is based on a hash of the block's proof-hash and
+// the previous stake modifier.
+// Stake modifier is recomputed at a fixed time interval instead of every
+// block. This is to make it difficult for an attacker to gain control of
+// additional bits in the stake modifier, even after generating a chain of
+// blocks.
+bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64_t& nStakeModifier, bool& fGeneratedStakeModifier)
+{
+    nStakeModifier = 0;
+    fGeneratedStakeModifier = false;
+    if (!pindexPrev)
+    {
+        fGeneratedStakeModifier = true;
+        return true;  // genesis block's modifier is 0
+    }
+    // First find current stake modifier and its generation block time
+    // if it's not old enough, return the same stake modifier
+    int64_t nModifierTime = 0;
+    if (!GetLastStakeModifier(pindexPrev, nStakeModifier, nModifierTime))
+        return error("ComputeNextStakeModifier: unable to get last modifier");
+    if (fDebug)
+    {
+        printf("ComputeNextStakeModifier: prev modifier=0x%016"PRIx64" time=%s\n", nStakeModifier, DateTimeStrFormat(nModifierTime).c_str());
+    }
+    if (nModifierTime / nModifierInterval >= pindexPrev->GetBlockTime() / nModifierInterval)
+        return true;
+    
+    // Sort candidate blocks by timestamp
+    vector<pair<int64_t, uint256> > vSortedByTimestamp;
+    vSortedByTimestamp.reserve(64 * nModifierInterval / nTargetSpacing);
+    int64_t nSelectionInterval = GetStakeModifierSelectionInterval();
+    int64_t nSelectionIntervalStart = (pindexPrev->GetBlockTime() / nModifierInterval) * nModifierInterval - nSelectionInterval;
+    const CBlockIndex* pindex = pindexPrev;
+    while (pindex && pindex->GetBlockTime() >= nSelectionIntervalStart)
+    {
+        vSortedByTimestamp.push_back(make_pair(pindex->GetBlockTime(), pindex->GetBlockHash()));
+        pindex = pindex->pprev;
+    }
+    int nHeightFirstCandidate = pindex ? (pindex->nHeight + 1) : 0;
+    reverse(vSortedByTimestamp.begin(), vSortedByTimestamp.end());
+    sort(vSortedByTimestamp.begin(), vSortedByTimestamp.end());
+    
+    // Select 64 blocks from candidate blocks to generate stake modifier
+    uint64_t nStakeModifierNew = 0;
+    int64_t nSelectionIntervalStop = nSelectionIntervalStart;
+    map<uint256, const CBlockIndex*> mapSelectedBlocks;
+    for (int nRound=0; nRound<min(64, (int)vSortedByTimestamp.size()); nRound++)
+    {
+        // add an interval section to the current selection round
+        nSelectionIntervalStop += GetStakeModifierSelectionIntervalSection(nRound);
+        // select a block from the candidates of current round
+        if (!SelectBlockFromCandidates(vSortedByTimestamp, mapSelectedBlocks, nSelectionIntervalStop, nStakeModifier, &pindex))
+            return error("ComputeNextStakeModifier: unable to select block at round %d", nRound);
+        // write the entropy bit of the selected block
+        nStakeModifierNew |= (((uint64_t)pindex->GetStakeEntropyBit()) << nRound);
+        // add the selected block from candidates to selected list
+        mapSelectedBlocks.insert(make_pair(pindex->GetBlockHash(), pindex));
+        if (fDebug && GetBoolArg("-printstakemodifier"))
+            printf("ComputeNextStakeModifier: selected round %d stop=%s height=%d bit=%d\n", nRound, DateTimeStrFormat(nSelectionIntervalStop).c_str(), pindex->nHeight, pindex->GetStakeEntropyBit());
+    }
+    
+    // Print selection map for visualization of the selected blocks
+    if (fDebug && GetBoolArg("-printstakemodifier"))
+    {
+        string strSelectionMap = "";
+        // '-' indicates proof-of-work blocks not selected
+        strSelectionMap.insert(0, pindexPrev->nHeight - nHeightFirstCandidate + 1, '-');
+        pindex = pindexPrev;
+        while (pindex && pindex->nHeight >= nHeightFirstCandidate)
+        {
+            // '=' indicates proof-of-stake blocks not selected
+            if (pindex->IsProofOfStake())
+                strSelectionMap.replace(pindex->nHeight - nHeightFirstCandidate, 1, "=");
+            pindex = pindex->pprev;
+        }
+        BOOST_FOREACH(const PAIRTYPE(uint256, const CBlockIndex*)& item, mapSelectedBlocks)
+        {
+            // 'S' indicates selected proof-of-stake blocks
+            // 'W' indicates selected proof-of-work blocks
+            strSelectionMap.replace(item.second->nHeight - nHeightFirstCandidate, 1, item.second->IsProofOfStake()? "S" : "W");
+        }
+        printf("ComputeNextStakeModifier: selection height [%d, %d] map %s\n", nHeightFirstCandidate, pindexPrev->nHeight, strSelectionMap.c_str());
+    }
+    if (fDebug)
+    {
+        printf("ComputeNextStakeModifier: new modifier=0x%016"PRIx64" time=%s\n", nStakeModifierNew, DateTimeStrFormat(pindexPrev->GetBlockTime()).c_str());
+    }
+    
+    nStakeModifier = nStakeModifierNew;
+    fGeneratedStakeModifier = true;
+    return true;
+}
+
+// The stake modifier used to hash for a stake kernel is chosen as the stake
+// modifier about a selection interval later than the coin generating the kernel
+static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64_t& nStakeModifier, int& nStakeModifierHeight, int64_t& nStakeModifierTime, bool fPrintProofOfStake)
+{
+    nStakeModifier = 0;
+    if (!mapBlockIndex.count(hashBlockFrom))
+        return error("GetKernelStakeModifier() : block not indexed");
+    const CBlockIndex* pindexFrom = mapBlockIndex[hashBlockFrom];
+    nStakeModifierHeight = pindexFrom->nHeight;
+    nStakeModifierTime = pindexFrom->GetBlockTime();
+    int64_t nStakeModifierSelectionInterval = GetStakeModifierSelectionInterval();
+    const CBlockIndex* pindex = pindexFrom;
+    // loop to find the stake modifier later by a selection interval
+    while (nStakeModifierTime < pindexFrom->GetBlockTime() + nStakeModifierSelectionInterval)
+    {
+        if (!pindex->pnext)
+        {   // reached best block; may happen if node is behind on block chain
+            if (fPrintProofOfStake || (pindex->GetBlockTime() + nStakeMinAge - nStakeModifierSelectionInterval > GetAdjustedTime()))
+                return error("GetKernelStakeModifier() : reached best block %s at height %d from block %s",
+                             pindex->GetBlockHash().ToString().c_str(), pindex->nHeight, hashBlockFrom.ToString().c_str());
+            else
+                return false;
+        }
+        pindex = pindex->pnext;
+        if (pindex->GeneratedStakeModifier())
+        {
+            nStakeModifierHeight = pindex->nHeight;
+            nStakeModifierTime = pindex->GetBlockTime();
+        }
+    }
+    nStakeModifier = pindex->nStakeModifier;
+    return true;
+}
+
+// ppcoin kernel protocol
+// coinstake must meet hash target according to the protocol:
+// kernel (input 0) must meet the formula
+//     hash(nStakeModifier + txPrev.block.nTime + txPrev.offset + txPrev.nTime + txPrev.vout.n + nTime) < bnTarget * nCoinDayWeight
+// this ensures that the chance of getting a coinstake is proportional to the
+// amount of coin age one owns.
+// The reason this hash is chosen is the following:
+//   nStakeModifier: scrambles computation to make it very difficult to precompute
+//                  future proof-of-stake at the time of the coin's confirmation
+//   txPrev.block.nTime: prevent nodes from guessing a good timestamp to
+//                       generate transaction for future advantage
+//   txPrev.offset: offset of txPrev inside block, to reduce the chance of
+//                  nodes generating coinstake at the same time
+//   txPrev.nTime: reduce the chance of nodes generating coinstake at the same
+//                 time
+//   txPrev.vout.n: output number of txPrev, to reduce the chance of nodes
+//                  generating coinstake at the same time
+//   block/tx hash should not be used here as they can be generated in vast
+//   quantities so as to generate blocks faster, degrading the system back into
+//   a proof-of-work situation.
+//
+bool CheckStakeKernelHashV1(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake)
+{
+    if (nTimeTx < txPrev.nTime)  // Transaction timestamp violation
+        return error("CheckStakeKernelHash() : nTime violation");
+    
+    unsigned int nTimeBlockFrom = blockFrom.GetBlockTime();
+    if (nTimeBlockFrom + nStakeMinAge > nTimeTx) // Min age requirement
+        return error("CheckStakeKernelHash() : min age violation");
+    
+    CBigNum bnTargetPerCoinDay;
+    bnTargetPerCoinDay.SetCompact(nBits);
+    int64_t nValueIn = txPrev.vout[prevout.n].nValue;
+    
+    uint256 hashBlockFrom = blockFrom.GetHash();
+    
+    CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)txPrev.nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
+    targetProofOfStake = (bnCoinDayWeight * bnTargetPerCoinDay).getuint256();
+    
+    // Calculate hash
+    CDataStream ss(SER_GETHASH, 0);
+    uint64_t nStakeModifier = 0;
+    int nStakeModifierHeight = 0;
+    int64_t nStakeModifierTime = 0;
+    
+    if ( !GetKernelStakeModifier(hashBlockFrom, nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake) )
+        return false;
+    ss << nStakeModifier << nTimeBlockFrom << nTxPrevOffset << txPrev.nTime << prevout.n << nTimeTx;
+    hashProofOfStake = Hash(ss.begin(), ss.end());
+    if (fPrintProofOfStake)
+    {
+        printf("CheckStakeKernelHash() : using modifier 0x%016"PRIx64" at height=%d timestamp=%s for block from height=%d timestamp=%s\n",
+               nStakeModifier, nStakeModifierHeight,
+               DateTimeStrFormat(nStakeModifierTime).c_str(),
+               mapBlockIndex[hashBlockFrom]->nHeight,
+               DateTimeStrFormat(blockFrom.GetBlockTime()).c_str());
+        printf("CheckStakeKernelHash() : check modifier=0x%016"PRIx64" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
+               nStakeModifier,
+               nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx,
+               hashProofOfStake.ToString().c_str());
+    }
+    
+    // Now check if proof-of-stake hash meets target protocol
+    if (CBigNum(hashProofOfStake) > bnCoinDayWeight * bnTargetPerCoinDay)
+        return false;
+    if (fDebug && !fPrintProofOfStake)
+    {
+        printf("CheckStakeKernelHash() : using modifier 0x%016"PRIx64" at height=%d timestamp=%s for block from height=%d timestamp=%s\n",
+               nStakeModifier, nStakeModifierHeight,
+               DateTimeStrFormat(nStakeModifierTime).c_str(),
+               mapBlockIndex[hashBlockFrom]->nHeight,
+               DateTimeStrFormat(blockFrom.GetBlockTime()).c_str());
+        printf("CheckStakeKernelHash() : pass modifier=0x%016"PRIx64" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
+               nStakeModifier,
+               nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx,
+               hashProofOfStake.ToString().c_str());
+    }
+    return true;
+}
+
+bool CheckStakeKernelHash(CBlockIndex* pindexPrev, unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake)
+{
+    if (IsPoSV2(pindexPrev->nHeight+1))
+        return CheckStakeKernelHashV2(pindexPrev, nBits, blockFrom.GetBlockTime(), txPrev, prevout, nTimeTx, hashProofOfStake, targetProofOfStake, fPrintProofOfStake);
+    else
+        return CheckStakeKernelHashV1(nBits, blockFrom, nTxPrevOffset, txPrev, prevout, nTimeTx, hashProofOfStake, targetProofOfStake, fPrintProofOfStake);
+}
+
+bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int64_t nSearchInterval, int64_t nFees, CTransaction& txNew, CKey& key)
+{
+    CBlockIndex* pindexPrev = pindexBest;
+    CBigNum bnTargetPerCoinDay;
+    bnTargetPerCoinDay.SetCompact(nBits);
+    
+    txNew.vin.clear();
+    txNew.vout.clear();
+    
+    // Mark coin stake transaction
+    CScript scriptEmpty;
+    scriptEmpty.clear();
+    txNew.vout.push_back(CTxOut(0, scriptEmpty));
+    
+    // Choose coins to use
+    int64_t nBalance = GetBalance();
+    
+    if (nBalance <= nReserveBalance)
+        return false;
+    
+    vector<const CWalletTx*> vwtxPrev;
+    
+    set<pair<const CWalletTx*,unsigned int> > setCoins;
+    int64_t nValueIn = 0;
+    
+    // Select coins with suitable depth
+    if (!SelectCoinsSimple(nBalance - nReserveBalance, txNew.nTime, nCoinbaseMaturity + 10, setCoins, nValueIn))
+        return false;
+    
+    if (setCoins.empty())
+        return false;
+    
+    int64_t nCredit = 0;
+    CScript scriptPubKeyKernel;
+    CTxDB txdb("r");
+    BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
+    {
+        CTxIndex txindex;
+        {
+            LOCK2(cs_main, cs_wallet);
+            if (!txdb.ReadTxIndex(pcoin.first->GetHash(), txindex))
+                continue;
+        }
+        
+        // Read block header
+        CBlock block;
+        {
+            LOCK2(cs_main, cs_wallet);
+            if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
+                continue;
+        }
+        
+        static int nMaxStakeSearchInterval = 60;
+        if (block.GetBlockTime() + nStakeMinAge > txNew.nTime - nMaxStakeSearchInterval)
+            continue; // only count coins meeting min age requirement
+        
+        bool fKernelFound = false;
+        for (unsigned int n=0; n<min(nSearchInterval,(int64_t)nMaxStakeSearchInterval) && !fKernelFound && !fShutdown && pindexPrev == pindexBest; n++)
+        {
+            // Search backward in time from the given txNew timestamp
+            // Search nSearchInterval seconds back up to nMaxStakeSearchInterval
+            uint256 hashProofOfStake = 0, targetProofOfStake = 0;
+            COutPoint prevoutStake = COutPoint(pcoin.first->GetHash(), pcoin.second);
+            if (CheckStakeKernelHash(pindexPrev, nBits, block, txindex.pos.nTxPos - txindex.pos.nBlockPos, *pcoin.first, prevoutStake, txNew.nTime - n, hashProofOfStake, targetProofOfStake))
+            {
+                // Found a kernel
+                if (fDebug && GetBoolArg("-printcoinstake"))
+                    printf("CreateCoinStake : kernel found\n");
+                vector<valtype> vSolutions;
+                txnouttype whichType;
+                CScript scriptPubKeyOut;
+                scriptPubKeyKernel = pcoin.first->vout[pcoin.second].scriptPubKey;
+                if (!Solver(scriptPubKeyKernel, whichType, vSolutions))
+                {
+                    if (fDebug && GetBoolArg("-printcoinstake"))
+                        printf("CreateCoinStake : failed to parse kernel\n");
+                    break;
+                }
+                if (fDebug && GetBoolArg("-printcoinstake"))
+                    printf("CreateCoinStake : parsed kernel type=%d\n", whichType);
+                if (whichType != TX_PUBKEY && whichType != TX_PUBKEYHASH)
+                {
+                    if (fDebug && GetBoolArg("-printcoinstake"))
+                        printf("CreateCoinStake : no support for kernel type=%d\n", whichType);
+                    break;  // only support pay to public key and pay to address
+                }
+                if (whichType == TX_PUBKEYHASH) // pay to address type
+                {
+                    // convert to pay to public key type
+                    if (!keystore.GetKey(uint160(vSolutions[0]), key))
+                    {
+                        if (fDebug && GetBoolArg("-printcoinstake"))
+                            printf("CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
+                        break;  // unable to find corresponding public key
+                    }
+                    scriptPubKeyOut << key.GetPubKey() << OP_CHECKSIG;
+                }
+                if (whichType == TX_PUBKEY)
+                {
+                    valtype& vchPubKey = vSolutions[0];
+                    if (!keystore.GetKey(Hash160(vchPubKey), key))
+                    {
+                        if (fDebug && GetBoolArg("-printcoinstake"))
+                            printf("CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
+                        break;  // unable to find corresponding public key
+                    }
+                    
+                    if (key.GetPubKey() != vchPubKey)
+                    {
+                        if (fDebug && GetBoolArg("-printcoinstake"))
+                            printf("CreateCoinStake : invalid key for kernel type=%d\n", whichType);
+                        break; // keys mismatch
+                    }
+                    
+                    scriptPubKeyOut = scriptPubKeyKernel;
+                }
+                
+                txNew.nTime -= n;
+                txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
+                nCredit += pcoin.first->vout[pcoin.second].nValue;
+                vwtxPrev.push_back(pcoin.first);
+                txNew.vout.push_back(CTxOut(0, scriptPubKeyOut));
+                
+                if (GetWeight(block.GetBlockTime(), (int64_t)txNew.nTime) < nStakeSplitAge)
+                    txNew.vout.push_back(CTxOut(0, scriptPubKeyOut)); //split stake
+                if (fDebug && GetBoolArg("-printcoinstake"))
+                    printf("CreateCoinStake : added kernel type=%d\n", whichType);
+                fKernelFound = true;
+                break;
+            }
+        }
+        
+        if (fKernelFound || fShutdown)
+            break; // if kernel is found stop searching
+    }
+    
+    if (nCredit == 0 || nCredit > nBalance - nReserveBalance)
+        return false;
+    
+    BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
+    {
+        // Attempt to add more inputs
+        // Only add coins of the same key/address as kernel
+        if (txNew.vout.size() == 2 && ((pcoin.first->vout[pcoin.second].scriptPubKey == scriptPubKeyKernel || pcoin.first->vout[pcoin.second].scriptPubKey == txNew.vout[1].scriptPubKey))
+            && pcoin.first->GetHash() != txNew.vin[0].prevout.hash)
+        {
+            int64_t nTimeWeight = GetWeight((int64_t)pcoin.first->nTime, (int64_t)txNew.nTime);
+            
+            // Stop adding more inputs if already too many inputs
+            if (txNew.vin.size() >= 100)
+                break;
+            // Stop adding more inputs if value is already pretty significant
+            if (nCredit >= nStakeCombineThreshold)
+                break;
+            // Stop adding inputs if reached reserve limit
+            if (nCredit + pcoin.first->vout[pcoin.second].nValue > nBalance - nReserveBalance)
+                break;
+            // Do not add additional significant input
+            if (pcoin.first->vout[pcoin.second].nValue >= nStakeCombineThreshold)
+                continue;
+            // Do not add input that is still too young
+            if (nTimeWeight < nStakeMinAge)
+                continue;
+            
+            txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
+            nCredit += pcoin.first->vout[pcoin.second].nValue;
+            vwtxPrev.push_back(pcoin.first);
+        }
+    }
+    
+    // Calculate coin age reward
+    {
+        uint64_t nCoinAge;
+        CTxDB txdb("r");
+        if (!txNew.GetCoinAge(txdb, nCoinAge))
+            return error("CreateCoinStake : failed to calculate coin age");
+        
+        int64_t nReward = GetProofOfStakeReward(nCoinAge, nFees);
+        if (nReward <= 0)
+            return false;
+        
+        nCredit += nReward;
+    }
+    
+    // Set output amount
+    if (txNew.vout.size() == 3)
+    {
+        txNew.vout[1].nValue = (nCredit / 2 / CENT) * CENT;
+        txNew.vout[2].nValue = nCredit - txNew.vout[1].nValue;
+    }
+    else
+        txNew.vout[1].nValue = nCredit;
+    
+    // Sign
+    int nIn = 0;
+    BOOST_FOREACH(const CWalletTx* pcoin, vwtxPrev)
+    {
+        if (!SignSignature(*this, *pcoin, txNew, nIn++))
+            return error("CreateCoinStake : failed to sign coinstake");
+    }
+    
+    // Limit size
+    unsigned int nBytes = ::GetSerializeSize(txNew, SER_NETWORK, PROTOCOL_VERSION);
+    if (nBytes >= MAX_BLOCK_SIZE_GEN/5)
+        return error("CreateCoinStake : exceeded coinstake size limit");
+    
+    // Successfully generated coinstake
+    return true;
+}
+
+// Check kernel hash target and coinstake signature
+bool CheckProofOfStake(CBlockIndex* pindexPrev, const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake)
+{
+    if (!tx.IsCoinStake())
+        return error("CheckProofOfStake() : called on non-coinstake %s", tx.GetHash().ToString().c_str());
+    
+    // Kernel (input 0) must match the stake hash target per coin age (nBits)
+    const CTxIn& txin = tx.vin[0];
+    
+    // First try finding the previous transaction in database
+    CTxDB txdb("r");
+    CTransaction txPrev;
+    CTxIndex txindex;
+    if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
+        return tx.DoS(1, error("CheckProofOfStake() : INFO: read txPrev failed"));  // previous transaction not in main chain, may occur during initial download
+    
+    // Verify signature
+    if (!VerifySignature(txPrev, tx, 0, 0))
+        return tx.DoS(100, error("CheckProofOfStake() : VerifySignature failed on coinstake %s", tx.GetHash().ToString().c_str()));
+    
+    // Read block header
+    CBlock block;
+    if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
+        return fDebug? error("CheckProofOfStake() : read block failed") : false; // unable to read block of previous transaction
+    
+    if (!CheckStakeKernelHash(pindexPrev, nBits, block, txindex.pos.nTxPos - txindex.pos.nBlockPos, txPrev, txin.prevout, tx.nTime, hashProofOfStake, targetProofOfStake, fDebug))
+        return tx.DoS(1, error("CheckProofOfStake() : INFO: check kernel failed on coinstake %s, hashProof=%s", tx.GetHash().ToString().c_str(), hashProofOfStake.ToString().c_str())); // may occur during initial download or if behind on block chain sync
+    
+    return true;
+}
+
+// Check whether the coinstake timestamp meets protocol
+bool CheckCoinStakeTimestamp(int64_t nTimeBlock, int64_t nTimeTx)
+{
+    // v0.3 protocol
+    return (nTimeBlock == nTimeTx);
+}
+
+// Get stake modifier checksum
+unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex)
+{
+    //assert (pindex->pprev || pindex->GetBlockHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet));
+    // Hash previous checksum with flags, hashProofOfStake and nStakeModifier
+    CDataStream ss(SER_GETHASH, 0);
+    if (pindex->pprev)
+        ss << pindex->pprev->nStakeModifierChecksum;
+    ss << pindex->nFlags << (pindex->IsProofOfStake() ? pindex->hashProof : 0) << pindex->nStakeModifier;
+    uint256 hashChecksum = Hash(ss.begin(), ss.end());
+    hashChecksum >>= (256 - 32);
+    return hashChecksum.Get64();
+}
+
+// Check stake modifier hard checkpoints
+bool CheckStakeModifierCheckpoints(int nHeight, unsigned int nStakeModifierChecksum)
+{
+    MapModifierCheckpoints& checkpoints = (fTestNet ? mapStakeModifierCheckpointsTestNet : mapStakeModifierCheckpoints);
+    
+    if (checkpoints.count(nHeight))
+        return nStakeModifierChecksum == checkpoints[nHeight];
+    return true;
+}
+// novacoin: attempt to generate suitable proof-of-stake
+bool CBlock::SignBlock(CWallet& wallet, int64_t nFees)
+{
+    // if we are trying to sign
+    //    something except proof-of-stake block template
+    if (!vtx[0].vout[0].IsEmpty())
+        return false;
+    
+    // if we are trying to sign
+    //    a complete proof-of-stake block
+    if (IsProofOfStake())
+        return true;
+    
+    static int64_t nLastCoinStakeSearchTime = GetAdjustedTime(); // startup timestamp
+    
+    CKey key;
+    CTransaction txCoinStake;
+    int64_t nSearchTime = txCoinStake.nTime; // search to current time
+    
+    if (nSearchTime > nLastCoinStakeSearchTime)
+    {
+        if (wallet.CreateCoinStake(wallet, nBits, nSearchTime-nLastCoinStakeSearchTime, nFees, txCoinStake, key))
+        {
+                if (txCoinStake.nTime >= max(pindexBest->GetPastTimeLimit()+1, PastDrift(pindexBest->GetBlockTime())))
+                {
+                    // make sure coinstake would meet timestamp protocol
+                    //    as it would be the same as the block timestamp
+                    vtx[0].nTime = nTime = txCoinStake.nTime;
+                    nTime = max(pindexBest->GetPastTimeLimit()+1, GetMaxTransactionTime());
+                    nTime = max(GetBlockTime(), PastDrift(pindexBest->GetBlockTime()));
+                    // we have to make sure that we have no future timestamps in
+                    //    our transactions set
+                    for (vector<CTransaction>::iterator it = vtx.begin(); it != vtx.end();)
+                        if (it->nTime > nTime) { it = vtx.erase(it); } else { ++it; }
+                    
+                    vtx.insert(vtx.begin() + 1, txCoinStake);
+                    hashMerkleRoot = BuildMerkleTree();
+                    
+                    // append a signature to our block
+                    return key.Sign(GetHash(), vchBlockSig);
+                }
+        }
+        nLastCoinStakeSearchInterval = nSearchTime - nLastCoinStakeSearchTime;
+        nLastCoinStakeSearchTime = nSearchTime;
+    }
+    
+    return false;
+}
+
+bool CBlock::CheckBlockSignature() const
+{
+    if (IsProofOfWork())
+        return vchBlockSig.empty();
+        
+        vector<valtype> vSolutions;
+    txnouttype whichType;
+    
+    const CTxOut& txout = vtx[1].vout[1];
+    
+    if (!Solver(txout.scriptPubKey, whichType, vSolutions))
+        return false;
+    
+    if (whichType == TX_PUBKEY)
+    {
+        valtype& vchPubKey = vSolutions[0];
+        CKey key;
+        if (!key.SetPubKey(vchPubKey))
+            return false;
+        if (vchBlockSig.empty())
+            return false;
+        return key.Verify(GetHash(), vchBlockSig);
+    }
+    
+    return false;
+}
+
+#endif

iguana/iguana_unspents.c

@@ -597,14 +597,14 @@ struct iguana_txid *iguana_txidfind(struct iguana_info *coin,int32_t *heightp,st
         return(0);
     for (i=lasthdrsi; i>=0; i--)
     {
-        if ( (bp= coin->bundles[i]) != 0 && bp->emitfinish > 1 )
+        if ( (bp= coin->bundles[i]) != 0 && (bp == coin->current || bp->emitfinish > 1) )
         {
             ramchain = (bp == coin->current) ? &coin->RTramchain : &bp->ramchain;
             if ( ramchain->H.data != 0 )
             {
                 if ( (TXbits= ramchain->txbits) == 0 )
                 {
-                    if ( coin->fastfind == 0 )
+                    if ( coin->fastfind == 0 && bp != coin->current )
                         iguana_alloctxbits(coin,ramchain);
                     if ( (TXbits= ramchain->txbits) == 0 )
                     {
@@ -813,11 +813,8 @@ int32_t iguana_unspentindfind(struct iguana_info *coin,int32_t *heightp,bits256
     {
         return(firstvout + vout);
     }
-    //else
-    {
-        if ( (tp= iguana_txidfind(coin,heightp,&TX,txid,lasthdrsi)) != 0 )
-            return(tp->firstvout + vout);
-    }
+    if ( (tp= iguana_txidfind(coin,heightp,&TX,txid,lasthdrsi)) != 0 )
+        return(tp->firstvout + vout);
     return(-1);
 }
 
@@ -2557,7 +2554,7 @@ int32_t iguana_bundlevalidate(struct iguana_info *coin,struct iguana_bundle *bp,
     static int32_t totalerrs,totalvalidated;
     FILE *fp; char fname[1024]; uint8_t *blockspace; uint32_t now = (uint32_t)time(NULL);
     int32_t i,max,len,errs = 0; struct sha256_vstate vstate; bits256 validatehash; int64_t total = 0;
-    if ( bp->ramchain.from_ro != 0 || bp == coin->current )
+    if ( (coin->VALIDATENODE == 0 && coin->RELAYNODE == 0) || bp->ramchain.from_ro != 0 || bp == coin->current )
     {
         bp->validated = (uint32_t)time(NULL);
         return(bp->n);

iguana/main.c

@@ -1146,7 +1146,7 @@ void iguana_appletests(struct supernet_info *myinfo)
             exit(-1);
         }
         sleep(1);*/
-        if ( 1 && (str= SuperNET_JSON(myinfo,cJSON_Parse("{\"prefetchlag\":-1,\"agent\":\"iguana\",\"method\":\"addcoin\",\"startpend\":500,\"endpend\":500,\"services\":128,\"maxpeers\":64,\"newcoin\":\"BTCD\",\"active\":1,\"numhelpers\":4,\"poll\":1}"),0,myinfo->rpcport)) != 0 )
+        if ( 1 && (str= SuperNET_JSON(myinfo,cJSON_Parse("{\"RELAY\":0,\"VALIDATE\":0,\"prefetchlag\":-1,\"agent\":\"iguana\",\"method\":\"addcoin\",\"startpend\":500,\"endpend\":500,\"services\":128,\"maxpeers\":64,\"newcoin\":\"BTC\",\"active\":1,\"numhelpers\":4,\"poll\":100}"),0,myinfo->rpcport)) != 0 )
         {
             free(str);
             if ( 0 && (str= SuperNET_JSON(myinfo,cJSON_Parse("{\"userhome\":\"/Users/jimbolaptop/Library/Application Support\",\"agent\":\"iguana\",\"method\":\"addcoin\",\"services\":1024,\"maxpeers\":256,\"newcoin\":\"BTCD\",\"active\":1}"),0,myinfo->rpcport)) != 0 )